Electronic Climate Control wtf?

[Stevo]

My ECC has fan speed control and temp settings but for some weird reason the modes are not switching. Air comes out as if it's stuckin neutral but doesnt blast air in the directions I select.

 

Any idea whats up?

[DaveFromColorado]

I'd guess you have a vacuum problem, not allowing it to move the HVAC doors properly.

 

--Dave.

[TeeJay3800]

Yep, most likely vacuum. Surprisingly, mine still works even though I have a leak somewhere under the dash...I can hear the vacuum system hissing depending on what mode the ECC is in.

[5speedz34]

Yep, most likely vacuum. Surprisingly, mine still works even though I have a leak somewhere under the dash...I can hear the vacuum system hissing depending on what mode the ECC is in.

 

That could be your blower motor hissing.

[TeeJay3800]

Yep, most likely vacuum. Surprisingly, mine still works even though I have a leak somewhere under the dash...I can hear the vacuum system hissing depending on what mode the ECC is in.

 

That could be your blower motor hissing.

No its definitely a vacuum hiss. The sound changes when the ECC changes modes, and it also does it when the system is completely off.

[cutlsp]

mine stoped working too oh well at least i'm tearing the dash off to replace it anyways

[CowboyBilly9Mile]

My ECC has fan speed control and temp settings but for some weird reason the modes are not switching. Air comes out as if it's stuckin neutral but doesnt blast air in the directions I select.

 

Any idea whats up?

 

You don't indicate where the air is currently comming out. On Ford, and therefore probably GM, the default position when there is no vacuum is defrost (safety reasons).

[Stevo]

Air comes out below and the window defogger... not upper vents and no extra umpfff that the defrost position has.

[5speedz34]

Those ECC's are notorious for going bad.